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CN105489165B - Pixel compensation circuit, method, scan drive circuit and flat display apparatus - Google Patents

Pixel compensation circuit, method, scan drive circuit and flat display apparatus Download PDF

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Publication number
CN105489165B
CN105489165B CN201610066459.0A CN201610066459A CN105489165B CN 105489165 B CN105489165 B CN 105489165B CN 201610066459 A CN201610066459 A CN 201610066459A CN 105489165 B CN105489165 B CN 105489165B
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controllable switch
switch
control terminal
driving
voltage
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CN105489165A (en
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聂诚磊
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to CN201610066459.0A priority Critical patent/CN105489165B/en
Priority to US15/028,920 priority patent/US10115340B2/en
Priority to PCT/CN2016/074557 priority patent/WO2017128469A1/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3266—Details of drivers for scan electrodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D30/00—Field-effect transistors [FET]
    • H10D30/60—Insulated-gate field-effect transistors [IGFET]
    • H10D30/67—Thin-film transistors [TFT]
    • H10D30/6729—Thin-film transistors [TFT] characterised by the electrodes
    • H10D30/673—Thin-film transistors [TFT] characterised by the electrodes characterised by the shapes, relative sizes or dispositions of the gate electrodes
    • H10D30/6733—Multi-gate TFTs
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H10K59/1216—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being capacitors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
    • H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
    • H10D86/471—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs having different architectures, e.g. having both top-gate and bottom-gate TFTs
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
    • H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
    • H10D86/60—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs wherein the TFTs are in active matrices

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  • Engineering & Computer Science (AREA)
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  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Geometry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

本发明公开了一种像素补偿电路、方法、扫描驱动电路及平面显示装置。像素补偿电路包括驱动开关的第一控制端连参考电压端，第一及第二可控开关的控制端连第一及第二扫描线，第一端连第一电压端，第二端连驱动开关的第一端；第二可控开关的第一端连驱动开关的第二端；有机发光二极管的阳极连第二可控开关的第二端，阴极接地；第三及第四可控开关的控制端连第三扫描线，第一端连第一可控开关的第二端及驱动开关的第一端，第二端连驱动开关的第二控制端；驱动开关的第二控制端经存储电容接地；第四可控开关的第一端连驱动开关的第二端，第二端连接数据线，以避免阈值电压漂移造成有机发光二极管的电流不稳定，以此实现面板亮度显示均匀。

The invention discloses a pixel compensation circuit, a method, a scanning driving circuit and a plane display device. The pixel compensation circuit includes the first control terminal of the drive switch connected to the reference voltage terminal, the control terminals of the first and second controllable switches connected to the first and second scan lines, the first terminal connected to the first voltage terminal, and the second terminal connected to the driver The first end of the switch; the first end of the second controllable switch is connected to the second end of the drive switch; the anode of the organic light emitting diode is connected to the second end of the second controllable switch, and the cathode is grounded; the third and fourth controllable switches The control terminal of the control terminal is connected with the third scan line, the first terminal is connected with the second terminal of the first controllable switch and the first terminal of the drive switch, and the second terminal is connected with the second control terminal of the drive switch; the second control terminal of the drive switch is connected via The storage capacitor is grounded; the first terminal of the fourth controllable switch is connected to the second terminal of the drive switch, and the second terminal is connected to the data line, so as to avoid the current instability of the organic light-emitting diode caused by the drift of the threshold voltage, so as to achieve uniform brightness display of the panel.

Description

像素补偿电路、方法、扫描驱动电路及平面显示装置Pixel compensation circuit, method, scanning driving circuit and flat display device

技术领域technical field

本发明涉及显示技术领域，特别是涉及一种像素补偿电路、方法、扫描驱动电路及平面显示装置。The invention relates to the field of display technology, in particular to a pixel compensation circuit, a method, a scanning driving circuit and a plane display device.

背景技术Background technique

目前的有机发光二极管(Organic Light Emitting diode，OLED)显示器具有体积小、结构简单、自主发光、亮度高、可视角度大、响应时间短等优点，吸引了广泛的注意。The current Organic Light Emitting diode (OLED) display has the advantages of small size, simple structure, self-luminescence, high brightness, wide viewing angle, short response time, etc., and has attracted extensive attention.

现有的有机发光二极管显示器中有一个晶体管作为驱动晶体管用于控制通过有机发光二极管OLED的电流，因此驱动晶体管的阈值电压的重要性便十分明显，所述阈值电压的正向或负向漂移都会使得在相同数据信号下有不同的电流通过有机发光二极管，目前的晶体管在使用过程中如氧化物半导体中的照光、源漏电极电压应力作用等因素，都可能导致阈值电压漂移，造成通过有机发光二极管的电流不稳定，进而引起面板亮度显示不均匀。In the existing organic light-emitting diode display, there is a transistor as a driving transistor for controlling the current passing through the organic light-emitting diode OLED, so the importance of the threshold voltage of the driving transistor is very obvious, and the positive or negative drift of the threshold voltage will cause Under the same data signal, different currents pass through the organic light-emitting diode. Factors such as illumination in the oxide semiconductor, source-drain electrode voltage stress, and other factors during the use of current transistors may cause threshold voltage drift, resulting in organic light-emitting diodes. The current of the diode is unstable, which in turn causes uneven brightness display of the panel.

发明内容Contents of the invention

本发明主要解决的技术问题是提供一种像素补偿电路、方法、扫描驱动电路及平面显示装置，以避免阈值电压漂移造成有机发光二极管的电流不稳定，以此实现面板亮度显示均匀。The technical problem mainly solved by the present invention is to provide a pixel compensation circuit, method, scanning drive circuit and flat panel display device, so as to avoid the current instability of the organic light-emitting diode caused by the threshold voltage drift, so as to realize uniform brightness display of the panel.

为解决上述技术问题，本发明采用的一个技术方案是：提供一种像素补偿电路，包括：In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a pixel compensation circuit, including:

驱动开关，所述驱动开关包括第一控制端、第二控制端、第一端及第二端，所述驱动开关的第一控制端连接一参考电压端，用于接收所述参考电压端输出的参考电压；A drive switch, the drive switch includes a first control terminal, a second control terminal, a first terminal and a second terminal, the first control terminal of the drive switch is connected to a reference voltage terminal for receiving the output of the reference voltage terminal the reference voltage;

第一可控开关，所述第一可控开关包括控制端、第一端及第二端，所述第一可控开关的控制端连接一第一扫描线，所述第一可控开关的第一端连接一第一电压端，用于接收所述第一电压端输出的第一电压，所述第一可控开关的第二端连接所述驱动开关的第一端；The first controllable switch, the first controllable switch includes a control terminal, a first terminal and a second terminal, the control terminal of the first controllable switch is connected to a first scanning line, the first controllable switch The first terminal is connected to a first voltage terminal for receiving the first voltage output by the first voltage terminal, and the second terminal of the first controllable switch is connected to the first terminal of the driving switch;

第二可控开关，所述第二可控开关包括控制端、第一端及第二端，所述第二可控开关的控制端连接一第二扫描线，所述第二可控开关的第一端连接所述驱动开关的第二端；The second controllable switch, the second controllable switch includes a control terminal, a first terminal and a second terminal, the control terminal of the second controllable switch is connected to a second scanning line, and the control terminal of the second controllable switch is connected to a second scanning line. the first end is connected to the second end of the driving switch;

有机发光二极管，所述有机发光二极管包括阳极及阴极，所述有机发光二极管的阳极连接所述第二可控开关的第二端，所述有机发光二极管的阴极接地；An organic light emitting diode, the organic light emitting diode includes an anode and a cathode, the anode of the organic light emitting diode is connected to the second end of the second controllable switch, and the cathode of the organic light emitting diode is grounded;

第三可控开关，所述第三可控开关包括控制端、第一端及第二端，所述第三可控开关的控制端连接一第三扫描线，所述第三可控开关的第一端连接所述第一可控开关的第二端及所述驱动开关的第一端，所述第三可控开关的第二端连接所述驱动开关的第二控制端；The third controllable switch, the third controllable switch includes a control terminal, a first terminal and a second terminal, the control terminal of the third controllable switch is connected to a third scanning line, the third controllable switch The first terminal is connected to the second terminal of the first controllable switch and the first terminal of the drive switch, and the second terminal of the third controllable switch is connected to the second control terminal of the drive switch;

存储电容，所述存储电容包括第一端及第二端，所述存储电容的第一端连接所述驱动开关的第二控制端及所述第三可控开关的第二端，所述存储电容的第二端接地；及A storage capacitor, the storage capacitor includes a first end and a second end, the first end of the storage capacitor is connected to the second control end of the driving switch and the second end of the third controllable switch, the storage the second terminal of the capacitor is grounded; and

第四可控开关，所述第四可控开关包括控制端、第一端及第二端，所述第四可控开关的控制端连接所述第三扫描线，所述第四可控开关的第一端连接所述驱动开关的第二端及所述第二可控开关的第一端，所述第四可控开关的第二端连接一数据线，用于接收所述数据线输出的第二电压。A fourth controllable switch, the fourth controllable switch includes a control terminal, a first terminal and a second terminal, the control terminal of the fourth controllable switch is connected to the third scanning line, the fourth controllable switch The first end of the drive switch is connected to the second end of the drive switch and the first end of the second controllable switch, and the second end of the fourth controllable switch is connected to a data line for receiving the data line output the second voltage.

其中，所述驱动开关为双栅极薄膜晶体管，所述驱动开关的第一控制端、第二控制端、第一端及第二端分别对应所述双栅极薄膜晶体管的底栅、顶栅、漏极及源极。Wherein, the driving switch is a double-gate thin film transistor, and the first control terminal, the second control terminal, the first terminal and the second terminal of the driving switch correspond to the bottom gate and the top gate of the double-gate thin film transistor respectively. , drain and source.

其中，所述第一可控开关至所述第四可控开关均为NMOS型薄膜晶体管，所述第一可控开关至所述第四可控开关的控制端、第一端及第二端分别对应所述NMOS型薄膜晶体管的栅极、漏极及源极。Wherein, the first controllable switch to the fourth controllable switch are all NMOS type thin film transistors, and the control terminal, the first terminal and the second terminal of the first controllable switch to the fourth controllable switch Corresponding to the gate, drain and source of the NMOS thin film transistor respectively.

为解决上述技术问题，本发明采用的另一个技术方案是：提供一种像素补偿方法，包括：In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a pixel compensation method, including:

在预充电阶段，驱动开关、第一可控开关、第三可控开关及第四可控开关均导通，第二可控开关截止，所述驱动开关的第二控制端与所述驱动开关的第一端相连，由于所述第一可控开关导通，所述驱动开关的第二控制端的电压与所述驱动开关的第一端的电压相等且均为所述第一电压，所述驱动开关的第一控制端的电压等于参考电压，由于所述第四可控开关导通，所述驱动开关的第二端的电压等于第二电压；In the pre-charging stage, the drive switch, the first controllable switch, the third controllable switch and the fourth controllable switch are all turned on, the second controllable switch is turned off, and the second control terminal of the drive switch is connected to the drive switch connected to the first end of the drive switch, and because the first controllable switch is turned on, the voltage of the second control end of the drive switch is equal to the voltage of the first end of the drive switch and both are the first voltage, the The voltage at the first control terminal of the driving switch is equal to the reference voltage, and since the fourth controllable switch is turned on, the voltage at the second terminal of the driving switch is equal to the second voltage;

在编程阶段，所述驱动开关、所述第三可控开关及所述第四可控开关均导通，所述第一可控开关及所述第二可控开关均截止，所述驱动开关的阈值电压非常小，随着所述驱动开关的第二控制端与所述驱动开关的第一端之间电压不断减小，所述驱动开关的阈值电压不断上升，直到所述驱动开关的第一控制端的电压与所述驱动开关的第二端的电压之间的差值等于所述驱动开关的阈值电压时，所述驱动开关的第二控制端的电压不再变化并存储在存储电容中；及In the programming stage, the driving switch, the third controllable switch and the fourth controllable switch are all turned on, the first controllable switch and the second controllable switch are all turned off, and the driving switch The threshold voltage of the drive switch is very small. As the voltage between the second control terminal of the drive switch and the first terminal of the drive switch decreases continuously, the threshold voltage of the drive switch continues to rise until the first terminal of the drive switch When the difference between the voltage of a control terminal and the voltage of the second terminal of the drive switch is equal to the threshold voltage of the drive switch, the voltage of the second control terminal of the drive switch does not change and is stored in the storage capacitor; and

在驱动发光阶段，所述驱动开关、所述第一可控开关及所述第二可控开关均导通，所述第三可控开关及所述第四可控开关均截止，在编程阶段得到的所述驱动开关的第二控制端的电压由所述存储电容维持，以使得所述驱动开关的阈值电压等于所述参考电压与所述第二电压的差值，此时所述驱动开关的第一控制端的电压仍然为所述参考电压，所述驱动开关的第二端的电压为有机发光二极管上的电压。In the stage of driving and emitting light, the driving switch, the first controllable switch and the second controllable switch are all turned on, and the third controllable switch and the fourth controllable switch are all turned off. In the programming stage The obtained voltage of the second control terminal of the driving switch is maintained by the storage capacitor, so that the threshold voltage of the driving switch is equal to the difference between the reference voltage and the second voltage, and at this time, the voltage of the driving switch is The voltage of the first control terminal is still the reference voltage, and the voltage of the second terminal of the driving switch is the voltage of the OLED.

其中，所述驱动开关为双栅极薄膜晶体管，所述驱动开关的第一控制端、第二控制端、第一端及第二端分别对应所述双栅极薄膜晶体管的底栅、顶栅、漏极及源极。Wherein, the driving switch is a double-gate thin film transistor, and the first control terminal, the second control terminal, the first terminal and the second terminal of the driving switch correspond to the bottom gate and the top gate of the double-gate thin film transistor respectively. , drain and source.

其中，所述第一可控开关至所述第四可控开关均为NMOS型薄膜晶体管，所述第一可控开关至所述第四可控开关的控制端、第一端及第二端分别对应所述NMOS型薄膜晶体管的栅极、漏极及源极。Wherein, the first controllable switch to the fourth controllable switch are all NMOS type thin film transistors, and the control terminal, the first terminal and the second terminal of the first controllable switch to the fourth controllable switch Corresponding to the gate, drain and source of the NMOS thin film transistor respectively.

为解决上述技术问题，本发明采用的另一个技术方案是：提供一种扫描驱动电路，所述扫描驱动电路包括像素补偿电路，所述像素补偿电路包括：In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a scanning driving circuit, the scanning driving circuit includes a pixel compensation circuit, and the pixel compensation circuit includes:

驱动开关，所述驱动开关包括第一控制端、第二控制端、第一端及第二端，所述驱动开关的第一控制端连接一参考电压端，用于接收所述参考电压端输出的参考电压；A drive switch, the drive switch includes a first control terminal, a second control terminal, a first terminal and a second terminal, the first control terminal of the drive switch is connected to a reference voltage terminal for receiving the output of the reference voltage terminal the reference voltage;

第一可控开关，所述第一可控开关包括控制端、第一端及第二端，所述第一可控开关的控制端连接一第一扫描线，所述第一可控开关的第一端连接一第一电压端，用于接收所述第一电压端输出的第一电压，所述第一可控开关的第二端连接所述驱动开关的第一端；The first controllable switch, the first controllable switch includes a control terminal, a first terminal and a second terminal, the control terminal of the first controllable switch is connected to a first scanning line, the first controllable switch The first terminal is connected to a first voltage terminal for receiving the first voltage output by the first voltage terminal, and the second terminal of the first controllable switch is connected to the first terminal of the driving switch;

第二可控开关，所述第二可控开关包括控制端、第一端及第二端，所述第二可控开关的控制端连接一第二扫描线，所述第二可控开关的第一端连接所述驱动开关的第二端；The second controllable switch, the second controllable switch includes a control terminal, a first terminal and a second terminal, the control terminal of the second controllable switch is connected to a second scanning line, and the control terminal of the second controllable switch is connected to a second scanning line. the first end is connected to the second end of the driving switch;

有机发光二极管，所述有机发光二极管包括阳极及阴极，所述有机发光二极管的阳极连接所述第二可控开关的第二端，所述有机发光二极管的阴极接地；An organic light emitting diode, the organic light emitting diode includes an anode and a cathode, the anode of the organic light emitting diode is connected to the second end of the second controllable switch, and the cathode of the organic light emitting diode is grounded;

第三可控开关，所述第三可控开关包括控制端、第一端及第二端，所述第三可控开关的控制端连接一第三扫描线，所述第三可控开关的第一端连接所述第一可控开关的第二端及所述驱动开关的第一端，所述第三可控开关的第二端连接所述驱动开关的第二控制端；The third controllable switch, the third controllable switch includes a control terminal, a first terminal and a second terminal, the control terminal of the third controllable switch is connected to a third scanning line, the third controllable switch The first terminal is connected to the second terminal of the first controllable switch and the first terminal of the drive switch, and the second terminal of the third controllable switch is connected to the second control terminal of the drive switch;

存储电容，所述存储电容包括第一端及第二端，所述存储电容的第一端连接所述驱动开关的第二控制端及所述第三可控开关的第二端，所述存储电容的第二端接地；及A storage capacitor, the storage capacitor includes a first end and a second end, the first end of the storage capacitor is connected to the second control end of the driving switch and the second end of the third controllable switch, the storage the second terminal of the capacitor is grounded; and

第四可控开关，所述第四可控开关包括控制端、第一端及第二端，所述第四可控开关的控制端连接所述第三扫描线，所述第四可控开关的第一端连接所述驱动开关的第二端及所述第二可控开关的第一端，所述第四可控开关的第二端连接一数据线，用于接收所述数据线输出的第二电压。A fourth controllable switch, the fourth controllable switch includes a control terminal, a first terminal and a second terminal, the control terminal of the fourth controllable switch is connected to the third scanning line, the fourth controllable switch The first end of the drive switch is connected to the second end of the drive switch and the first end of the second controllable switch, and the second end of the fourth controllable switch is connected to a data line for receiving the data line output the second voltage.

其中，所述驱动开关为双栅极薄膜晶体管，所述驱动开关的第一控制端、第二控制端、第一端及第二端分别对应所述双栅极薄膜晶体管的底栅、顶栅、漏极及源极，所述第一可控开关至所述第四可控开关均为NMOS型薄膜晶体管，所述第一可控开关至所述第四可控开关的控制端、第一端及第二端分别对应所述NMOS型薄膜晶体管的栅极、漏极及源极。Wherein, the driving switch is a double-gate thin film transistor, and the first control terminal, the second control terminal, the first terminal and the second terminal of the driving switch correspond to the bottom gate and the top gate of the double-gate thin film transistor respectively. , drain and source, the first controllable switch to the fourth controllable switch are all NMOS type thin film transistors, the control terminals of the first controllable switch to the fourth controllable switch, the first The terminal and the second terminal respectively correspond to the gate, the drain and the source of the NMOS thin film transistor.

为解决上述技术问题，本发明采用的另一个技术方案是：提供一种平面显示装置，所述平面显示装置包括像素补偿电路，所述像素补偿电路包括：In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a flat display device, the flat display device includes a pixel compensation circuit, and the pixel compensation circuit includes:

驱动开关，所述驱动开关包括第一控制端、第二控制端、第一端及第二端，所述驱动开关的第一控制端连接一参考电压端，用于接收所述参考电压端输出的参考电压；A drive switch, the drive switch includes a first control terminal, a second control terminal, a first terminal and a second terminal, the first control terminal of the drive switch is connected to a reference voltage terminal for receiving the output of the reference voltage terminal the reference voltage;

第一可控开关，所述第一可控开关包括控制端、第一端及第二端，所述第一可控开关的控制端连接一第一扫描线，所述第一可控开关的第一端连接一第一电压端，用于接收所述第一电压端输出的第一电压，所述第一可控开关的第二端连接所述驱动开关的第一端；The first controllable switch, the first controllable switch includes a control terminal, a first terminal and a second terminal, the control terminal of the first controllable switch is connected to a first scanning line, the first controllable switch The first terminal is connected to a first voltage terminal for receiving the first voltage output by the first voltage terminal, and the second terminal of the first controllable switch is connected to the first terminal of the driving switch;

第二可控开关，所述第二可控开关包括控制端、第一端及第二端，所述第二可控开关的控制端连接一第二扫描线，所述第二可控开关的第一端连接所述驱动开关的第二端；The second controllable switch, the second controllable switch includes a control terminal, a first terminal and a second terminal, the control terminal of the second controllable switch is connected to a second scanning line, and the control terminal of the second controllable switch is connected to a second scanning line. the first end is connected to the second end of the driving switch;

有机发光二极管，所述有机发光二极管包括阳极及阴极，所述有机发光二极管的阳极连接所述第二可控开关的第二端，所述有机发光二极管的阴极接地；An organic light emitting diode, the organic light emitting diode includes an anode and a cathode, the anode of the organic light emitting diode is connected to the second end of the second controllable switch, and the cathode of the organic light emitting diode is grounded;

第三可控开关，所述第三可控开关包括控制端、第一端及第二端，所述第三可控开关的控制端连接一第三扫描线，所述第三可控开关的第一端连接所述第一可控开关的第二端及所述驱动开关的第一端，所述第三可控开关的第二端连接所述驱动开关的第二控制端；The third controllable switch, the third controllable switch includes a control terminal, a first terminal and a second terminal, the control terminal of the third controllable switch is connected to a third scanning line, the third controllable switch The first terminal is connected to the second terminal of the first controllable switch and the first terminal of the drive switch, and the second terminal of the third controllable switch is connected to the second control terminal of the drive switch;

存储电容，所述存储电容包括第一端及第二端，所述存储电容的第一端连接所述驱动开关的第二控制端及所述第三可控开关的第二端，所述存储电容的第二端接地；及A storage capacitor, the storage capacitor includes a first end and a second end, the first end of the storage capacitor is connected to the second control end of the driving switch and the second end of the third controllable switch, the storage the second terminal of the capacitor is grounded; and

第四可控开关，所述第四可控开关包括控制端、第一端及第二端，所述第四可控开关的控制端连接所述第三扫描线，所述第四可控开关的第一端连接所述驱动开关的第二端及所述第二可控开关的第一端，所述第四可控开关的第二端连接一数据线，用于接收所述数据线输出的第二电压。A fourth controllable switch, the fourth controllable switch includes a control terminal, a first terminal and a second terminal, the control terminal of the fourth controllable switch is connected to the third scanning line, the fourth controllable switch The first end of the drive switch is connected to the second end of the drive switch and the first end of the second controllable switch, and the second end of the fourth controllable switch is connected to a data line for receiving the data line output the second voltage.

其中，所述驱动开关为双栅极薄膜晶体管，所述驱动开关的第一控制端、第二控制端、第一端及第二端分别对应所述双栅极薄膜晶体管的底栅、顶栅、漏极及源极，所述第一可控开关至所述第四可控开关均为NMOS型薄膜晶体管，所述第一可控开关至所述第四可控开关的控制端、第一端及第二端分别对应所述NMOS型薄膜晶体管的栅极、漏极及源极。Wherein, the driving switch is a double-gate thin film transistor, and the first control terminal, the second control terminal, the first terminal and the second terminal of the driving switch correspond to the bottom gate and the top gate of the double-gate thin film transistor respectively. , drain and source, the first controllable switch to the fourth controllable switch are all NMOS type thin film transistors, the control terminals of the first controllable switch to the fourth controllable switch, the first The terminal and the second terminal respectively correspond to the gate, the drain and the source of the NMOS thin film transistor.

本发明的有益效果是：区别于现有技术的情况，本发明的所述像素补偿电路及方法通过使用双栅极薄膜晶体管作为驱动晶体管，因为双栅极薄膜晶体管所受到电压与光照的应力影响较小，同时由于双栅极薄膜晶体管阈值电压与顶栅电压负相关特性，能够通过输入预设电压来指定驱动晶体管的阈值电压，无需通过调整数据信号的大小来减弱驱动晶体管的阈值电压漂移，因此也不会增加驱动管的应力影响，以此避免了所述驱动晶体管的阈值电压漂移造成所述有机发光二极管的电流不稳定，以此实现面板亮度显示均匀。The beneficial effects of the present invention are: different from the situation in the prior art, the pixel compensation circuit and method of the present invention use a double-gate thin film transistor as a driving transistor, because the double-gate thin film transistor is affected by the stress of voltage and light At the same time, due to the negative correlation between the threshold voltage of the double-gate thin film transistor and the top gate voltage, the threshold voltage of the driving transistor can be specified by inputting a preset voltage, and there is no need to reduce the threshold voltage drift of the driving transistor by adjusting the size of the data signal. Therefore, the influence of stress on the driving transistor will not be increased, thereby avoiding the current instability of the organic light-emitting diode caused by the threshold voltage drift of the driving transistor, thereby achieving uniform brightness display of the panel.

附图说明Description of drawings

图1是本发明的像素补偿电路的结构示意图；1 is a schematic structural diagram of a pixel compensation circuit of the present invention;

图2是本发明的像素补偿电路的波形图；Fig. 2 is a waveform diagram of the pixel compensation circuit of the present invention;

图3是本发明的扫描驱动电路的示意图；Fig. 3 is the schematic diagram of the scanning driving circuit of the present invention;

图4是本发明的平面显示装置的示意图。FIG. 4 is a schematic diagram of a flat display device of the present invention.

具体实施方式Detailed ways

请参阅图1，是本发明的像素补偿电路的结构示意图。如图1所示，本发明的像素补偿电路包括驱动开关T0，所述驱动开关T0包括第一控制端BG、第二控制端TG、第一端D及第二端S，所述驱动开关T0的第一控制端BG连接一参考电压端VPRE，用于接收所述参考电压端VPRE输出的参考电压Vpre；Please refer to FIG. 1 , which is a schematic structural diagram of the pixel compensation circuit of the present invention. As shown in FIG. 1 , the pixel compensation circuit of the present invention includes a drive switch T0, the drive switch T0 includes a first control terminal BG, a second control terminal TG, a first terminal D, and a second terminal S, and the drive switch T0 The first control terminal BG is connected to a reference voltage terminal VPRE for receiving the reference voltage V pre output by the reference voltage terminal VPRE;

第一可控开关T1，所述第一可控开关T1包括控制端、第一端及第二端，所述第一可控开关T1的控制端连接一第一扫描线scan2，所述第一可控开关T1的第一端连接一第一电压端VDD1，用于接收所述第一电压端VDD1输出的第一电压VDD，所述第一可控开关T1的第二端连接所述驱动开关T0的第一端D；The first controllable switch T1, the first controllable switch T1 includes a control terminal, a first terminal and a second terminal, the control terminal of the first controllable switch T1 is connected to a first scan line scan2, the first The first terminal of the controllable switch T1 is connected to a first voltage terminal VDD1 for receiving the first voltage VDD output from the first voltage terminal VDD1, and the second terminal of the first controllable switch T1 is connected to the drive switch the first terminal D of T0;

第二可控开关T2，所述第二可控开关T2包括控制端、第一端及第二端，所述第二可控开关T2的控制端连接一第二扫描线scan3，所述第二可控开关T2的第一端连接所述驱动开关T0的第二端S；The second controllable switch T2, the second controllable switch T2 includes a control terminal, a first terminal and a second terminal, the control terminal of the second controllable switch T2 is connected to a second scanning line scan3, the second The first end of the controllable switch T2 is connected to the second end S of the driving switch T0;

有机发光二极管D1，所述有机发光二极管D1包括阳极及阴极，所述有机发光二极管D1的阳极连接所述第二可控开关T2的第二端，所述有机发光二极管D1的阴极接地；An organic light emitting diode D1, the organic light emitting diode D1 includes an anode and a cathode, the anode of the organic light emitting diode D1 is connected to the second end of the second controllable switch T2, and the cathode of the organic light emitting diode D1 is grounded;

第三可控开关T3，所述第三可控开关T3包括控制端、第一端及第二端，所述第三可控开关T3的控制端连接一第三扫描线scan1，所述第三可控开关T3的第一端连接所述第一可控开关T1的第二端及所述驱动开关T0的第一端D，所述第三可控开关T3的第二端S连接所述驱动开关T0的第二控制端TG；The third controllable switch T3, the third controllable switch T3 includes a control terminal, a first terminal and a second terminal, the control terminal of the third controllable switch T3 is connected to a third scanning line scan1, the third The first end of the controllable switch T3 is connected to the second end of the first controllable switch T1 and the first end D of the driving switch T0, and the second end S of the third controllable switch T3 is connected to the driving a second control terminal TG of the switch T0;

存储电容C1，所述存储电容C1包括第一端及第二端，所述存储电容C1的第一端连接所述驱动开关T0的第二控制端TG及所述第三可控开关T3的第二端，所述存储电容C1的第二端接地；Storage capacitor C1, the storage capacitor C1 includes a first terminal and a second terminal, the first terminal of the storage capacitor C1 is connected to the second control terminal TG of the drive switch T0 and the first terminal T3 of the third controllable switch T3 Two terminals, the second terminal of the storage capacitor C1 is grounded;

第四可控开关T4，所述第四可控开关T4包括控制端、第一端及第二端，所述第四可控开关T4的控制端连接所述第三扫描线scan3，所述第四可控开关T4的第一端连接所述驱动开关T0的第二端S及所述第二可控开关T2的第一端，所述第四可控开关T4的第二端连接一数据线Data，用于接收所述数据线Data输出的第二电压VData。A fourth controllable switch T4, the fourth controllable switch T4 includes a control terminal, a first terminal and a second terminal, the control terminal of the fourth controllable switch T4 is connected to the third scanning line scan3, the first The first end of the four controllable switch T4 is connected to the second end S of the driving switch T0 and the first end of the second controllable switch T2, and the second end of the fourth controllable switch T4 is connected to a data line Data, for receiving the second voltage V Data output by the data line Data.

在本实施例中，所述驱动开关T0为双栅极薄膜晶体管，所述驱动开关T0的第一控制端BG、第二控制端TG、第一端D及第二端S分别对应所述双栅极薄膜晶体管的底栅、顶栅、漏极及源极。In this embodiment, the driving switch T0 is a double-gate thin film transistor, and the first control terminal BG, the second control terminal TG, the first terminal D and the second terminal S of the driving switch T0 respectively correspond to the double-gate Gate The bottom gate, top gate, drain and source of the gate thin film transistor.

在本实施例中，所述第一可控开关至所述第四可控开关T1-T4均为NMOS型薄膜晶体管，所述第一可控开关至所述第四可控开关T1-T4的控制端、第一端及第二端分别对应所述NMOS型薄膜晶体管的栅极、漏极及源极。In this embodiment, the first controllable switch to the fourth controllable switch T1-T4 are all NMOS thin film transistors, and the first controllable switch to the fourth controllable switch T1-T4 The control terminal, the first terminal and the second terminal respectively correspond to the gate, drain and source of the NMOS thin film transistor.

请参阅图2，是本发明上述实施例的所述像素补偿电路的波形图。根据图1及图2获得所述像素补偿电路的工作原理如下(即所述像素补偿方法)：在预充电阶段，驱动开关T0、第一可控开关T1、第三可控开关T3及第四可控开关T4均导通，第二可控开关T2截止，所述驱动开关T0的第二控制端TG与所述驱动开关T0的第一端D相连，由于所述第一可控开关T1导通，所述驱动开关T0的第二控制端TG的电压与所述驱动开关T0的第一端D的电压相等且均为所述第一电压VDD，即VTG＝VD＝VDD(公式1)，所述驱动开关T0的第一控制端BG的电压等于参考电压Vpre，即VBG＝Vpre(公式2)，由于所述第四可控开关T4导通，所述驱动开关T0的第二端S的电压等于第二电压VData，即VS＝VData(公式3)，完成初始化过程；Please refer to FIG. 2 , which is a waveform diagram of the pixel compensation circuit in the above embodiment of the present invention. According to Figure 1 and Figure 2, the working principle of the pixel compensation circuit is as follows (that is, the pixel compensation method): in the pre-charging stage, the drive switch T0, the first controllable switch T1, the third controllable switch T3 and the fourth The controllable switches T4 are all turned on, the second controllable switch T2 is turned off, the second control terminal TG of the driving switch T0 is connected to the first terminal D of the driving switch T0, because the first controllable switch T1 conducts On, the voltage of the second control terminal TG of the driving switch T0 is equal to the voltage of the first terminal D of the driving switch T0 and both are the first voltage VDD, that is, V TG =V D =VDD (Formula 1 ), the voltage of the first control terminal BG of the driving switch T0 is equal to the reference voltage V pre , that is, V BG =V pre (formula 2), since the fourth controllable switch T4 is turned on, the voltage of the driving switch T0 The voltage of the second terminal S is equal to the second voltage V Data , that is, V S =V Data (Formula 3), and the initialization process is completed;

在编程阶段，所述驱动开关T0、所述第三可控开关T3及所述第四可控开关T4均导通，所述第一可控开关T1及所述第二可控开关T2均截止，所述驱动开关T0的阈值电压Vth非常小，随着所述驱动开关T0的第二控制端TG与所述驱动开关T0的第一端D之间电压不断减小，所述驱动开关T0的阈值电压Vth不断上升，直到所述驱动开关T0的第一控制端BG的电压与所述驱动开关T0的第二端S的电压之间的差值等于所述驱动开关T0的阈值电压Vth时，即VBG-VS＝Vth(公式4)，所述驱动开关T0的第二控制端TG的电压不再变化并存储在存储电容C1中，此时所述驱动开关T0的阈值电压Vth＝VBG-VS＝Vpre-VData(公式5)；In the programming stage, the drive switch T0, the third controllable switch T3 and the fourth controllable switch T4 are all turned on, and the first controllable switch T1 and the second controllable switch T2 are all turned off , the threshold voltage Vth of the driving switch T0 is very small, as the voltage between the second control terminal TG of the driving switch T0 and the first terminal D of the driving switch T0 decreases continuously, the voltage of the driving switch T0 The threshold voltage Vth keeps rising until the difference between the voltage of the first control terminal BG of the driving switch T0 and the voltage of the second terminal S of the driving switch T0 is equal to the threshold voltage Vth of the driving switch T0, That is, V BG −V S =V th (Formula 4), the voltage of the second control terminal TG of the drive switch T0 no longer changes and is stored in the storage capacitor C1, at this time the threshold voltage V th of the drive switch T0 =V BG -V S =V pre -V Data (Equation 5);

在驱动发光阶段，所述驱动开关T0、所述第一可控开关T1及所述第二可控开关T2均导通，所述第三可控开关T3及所述第四可控开关T4均截止，在编程阶段得到的所述驱动开关T0的第二控制端TG的电压由所述存储电容C1维持，以使得所述驱动开关T0的阈值电压Vth等于所述参考电压Vpre与所述第二电压VData的差值，即Vth＝Vpre-VData(公式6)，此时所述驱动开关T0的第一控制端BG的电压仍然为所述参考电压Vpre，所述驱动开关T0的第二端S的电压为有机发光二极管D1上的电压VOLED，根据晶体管电流公式及上述公式1至公式6得到：In the driving light emitting stage, the driving switch T0, the first controllable switch T1 and the second controllable switch T2 are all turned on, and the third controllable switch T3 and the fourth controllable switch T4 are all turned on. At the end, the voltage of the second control terminal TG of the driving switch T0 obtained in the programming phase is maintained by the storage capacitor C1, so that the threshold voltage Vth of the driving switch T0 is equal to the reference voltage V pre and the first The difference between the two voltages V Data , that is, V th= V pre −V Data (formula 6), at this time, the voltage of the first control terminal BG of the drive switch T0 is still the reference voltage V pre , and the drive switch The voltage at the second terminal S of T0 is the voltage V OLED on the organic light emitting diode D1, which can be obtained according to the transistor current formula and the above formulas 1 to 6:

I＝β(VBG-Vth-Vs)2＝β(Vpre-Vpre+VData-VOLED)2＝β(VData-VOLED)2 (公式7)I=β(V BG -V th -V s ) 2 =β(V pre -V pre +V Data -V OLED ) 2 =β(V Data -V OLED ) 2 (Formula 7)

由上述公式7可以看出，通过所述有机发光二极管D1的电流与所述驱动开关T0的阈值电压Vth无关，因此，所述像素补偿电路避免了所述驱动开关T0的阈值电压Vth漂移造成所述有机发光二极管D1的电流不稳定，以此实现面板亮度显示均匀。It can be seen from the above formula 7 that the current passing through the organic light emitting diode D1 has nothing to do with the threshold voltage V th of the driving switch T0, therefore, the pixel compensation circuit prevents the threshold voltage V th of the driving switch T0 from drifting The current of the organic light emitting diode D1 is caused to be unstable, so as to achieve uniform brightness display of the panel.

请参阅图3，为本发明一种扫描驱动电路的示意图。所述扫描驱动电路中包括所述像素补偿电路，用于避免所述扫描驱动电路中的驱动晶体管发生阈值电压漂移，从而造成面板亮度显示不均匀。Please refer to FIG. 3 , which is a schematic diagram of a scanning driving circuit of the present invention. The scanning driving circuit includes the pixel compensation circuit, which is used to prevent the threshold voltage drift of the driving transistor in the scanning driving circuit, thus causing uneven brightness display of the panel.

请参阅图4，为本发明一种平面显示装置的示意图。所述平面显示装置例如可为OLED，其包括前述的扫描驱动电路及像素补偿电路，所述具有像素补偿电路的扫描驱动电路设置在所述平面显示装置的周边，例如设置在平面显示装置的两端。Please refer to FIG. 4 , which is a schematic diagram of a flat panel display device of the present invention. The flat display device can be OLED, for example, which includes the aforementioned scanning driving circuit and pixel compensation circuit, and the scanning driving circuit with the pixel compensation circuit is arranged on the periphery of the flat display device, for example, on both sides of the flat display device. end.

所述像素补偿电路及方法通过使用双栅极薄膜晶体管作为驱动晶体管，因为双栅极薄膜晶体管所受到电压与光照的应力影响较小，同时由于双栅极薄膜晶体管阈值电压与顶栅电压负相关特性，能够通过输入预设电压来指定驱动晶体管的阈值电压，无需通过调整数据信号的大小来减弱驱动晶体管的阈值电压漂移，因此也不会增加驱动管的应力影响，以此避免了所述驱动晶体管的阈值电压漂移造成所述有机发光二极管的电流不稳定，以此实现面板亮度显示均匀。The pixel compensation circuit and method use a double-gate thin film transistor as a driving transistor, because the double-gate thin film transistor is less affected by the stress of voltage and light, and because the threshold voltage of the double-gate thin film transistor is negatively correlated with the top gate voltage characteristics, the threshold voltage of the drive transistor can be specified by inputting a preset voltage, and there is no need to adjust the magnitude of the data signal to weaken the threshold voltage drift of the drive transistor, so it will not increase the stress of the drive tube, thereby avoiding the drive The drift of the threshold voltage of the transistor causes the current of the organic light emitting diode to be unstable, so as to realize uniform brightness display of the panel.

以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。The above is only the embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technologies fields, all of which are equally included in the scope of patent protection of the present invention.

Claims (10)

1. a kind of pixel compensation circuit, it is characterised in that the pixel compensation circuit includes：
Driving switch, the driving switch include the first control terminal, the second control terminal, first end and second end, and the driving is opened The first control terminal closed connects a reference voltage end, for receiving the reference voltage of the reference voltage end output；
First controllable switch, first controllable switch include control terminal, first end and second end, first controllable switch Control terminal connects one first scan line, and the first end of first controllable switch connects a first voltage end, described for receiving The first voltage of first voltage end output, the second end of first controllable switch connect the first end of the driving switch；
Second controllable switch, second controllable switch include control terminal, first end and second end, second controllable switch Control terminal connects one second scan line, and the first end of second controllable switch connects the second end of the driving switch；
Organic Light Emitting Diode, the Organic Light Emitting Diode include anode and cathode, the anode of the Organic Light Emitting Diode Connect the second end of second controllable switch, the minus earth of the Organic Light Emitting Diode；
3rd controllable switch, the 3rd controllable switch include control terminal, first end and second end, the 3rd controllable switch Control terminal connects a three scan line, the first end of the 3rd controllable switch connect first controllable switch second end and The first end of the driving switch, the second end of the 3rd controllable switch connect the second control terminal of the driving switch；
Storage capacitance, the storage capacitance include first end and second end, and the first end of the storage capacitance connects the driving Second control terminal of switch and the second end of the 3rd controllable switch, the second end ground connection of the storage capacitance；And
4th controllable switch, the 4th controllable switch include control terminal, first end and second end, the 4th controllable switch Control terminal connects the three scan line, and the first end of the 4th controllable switch connects second end and the institute of the driving switch The first end of the second controllable switch is stated, the second end of the 4th controllable switch connects a data cable, for receiving the data The second voltage of line output.
2. pixel compensation circuit according to claim 1, it is characterised in that the driving switch is double-gate film crystal Pipe, the first control terminal, the second control terminal, first end and the second end of the driving switch correspond to the double-gate film crystalline substance respectively Bottom gate, top-gated, drain electrode and the source electrode of body pipe.
3. pixel compensation circuit according to claim 1, it is characterised in that first controllable switch to the described 4th can It is nmos type thin film transistor (TFT) to control switch, control terminal, the first end of first controllable switch to the 4th controllable switch And second end corresponds to grid, drain electrode and the source electrode of the nmos type thin film transistor (TFT) respectively.
4. a kind of pixel compensation method, it is characterised in that the pixel compensation method includes：Driving switch, the driving switch Including the first control terminal, the second control terminal, first end and second end, the first control terminal connection one of the driving switch is with reference to electricity Pressure side, for receiving the reference voltage of the reference voltage end output；
First controllable switch, first controllable switch include control terminal, first end and second end, first controllable switch Control terminal connects one first scan line, and the first end of first controllable switch connects a first voltage end, described for receiving The first voltage of first voltage end output, the second end of first controllable switch connect the first end of the driving switch；
Second controllable switch, second controllable switch include control terminal, first end and second end, second controllable switch Control terminal connects one second scan line, and the first end of second controllable switch connects the second end of the driving switch；
Organic Light Emitting Diode, the Organic Light Emitting Diode include anode and cathode, the anode of the Organic Light Emitting Diode Connect the second end of second controllable switch, the minus earth of the Organic Light Emitting Diode；
3rd controllable switch, the 3rd controllable switch include control terminal, first end and second end, the 3rd controllable switch Control terminal connects a three scan line, the first end of the 3rd controllable switch connect first controllable switch second end and The first end of the driving switch, the second end of the 3rd controllable switch connect the second control terminal of the driving switch；
Storage capacitance, the storage capacitance include first end and second end, and the first end of the storage capacitance connects the driving Second control terminal of switch and the second end of the 3rd controllable switch, the second end ground connection of the storage capacitance；And
4th controllable switch, the 4th controllable switch include control terminal, first end and second end, the 4th controllable switch Control terminal connects the three scan line, and the first end of the 4th controllable switch connects second end and the institute of the driving switch The first end of the second controllable switch is stated, the second end of the 4th controllable switch connects a data cable, for receiving the data The second voltage of line output；
In pre-charging stage, the driving switch, first controllable switch, the 3rd controllable switch and described 4th controllable Switch is both turned on, the second controllable switch cut-off, the second control terminal of the driving switch and the first of the driving switch End is connected, since first controllable switch turns on, voltage and the driving switch of the second control terminal of the driving switch First end voltage it is equal and be the first voltage, the voltage of the first control terminal of the driving switch is equal to the ginseng Voltage is examined, since the 4th controllable switch turns on, the voltage of the second end of the driving switch is equal to the second voltage；
In programming phases, the driving switch, the 3rd controllable switch and the 4th controllable switch are both turned on, and described first Controllable switch and second controllable switch are turned off, and the threshold voltage of the driving switch is very small, as the driving is opened Voltage constantly reduces between the second control terminal and the first end of the driving switch closed, and the threshold voltage of the driving switch is not It is disconnected to rise, until the first control terminal of the driving switch voltage and the driving switch second end voltage between difference When value is equal to the threshold voltage of the driving switch, the voltage of the second control terminal of the driving switch no longer changes and is stored in In the storage capacitance；And
In driving glow phase, the driving switch, first controllable switch and second controllable switch are both turned on, described 3rd controllable switch and the 4th controllable switch are turned off, in the second control terminal of the driving switch that programming phases obtain Voltage maintained by the storage capacitance so that the threshold voltage of the driving switch is equal to the reference voltage and described the The difference of two voltages, at this time the voltage of the first control terminal of the driving switch remain as the reference voltage, the driving is opened The voltage of the second end of pass is the voltage on Organic Light Emitting Diode.
5. pixel compensation method according to claim 4, it is characterised in that the driving switch is double-gate film crystal Pipe, the first control terminal, the second control terminal, first end and the second end of the driving switch correspond to the double-gate film crystalline substance respectively Bottom gate, top-gated, drain electrode and the source electrode of body pipe.
6. pixel compensation method according to claim 4, it is characterised in that first controllable switch to the described 4th can It is nmos type thin film transistor (TFT) to control switch, control terminal, the first end of first controllable switch to the 4th controllable switch And second end corresponds to grid, drain electrode and the source electrode of the nmos type thin film transistor (TFT) respectively.
7. a kind of scan drive circuit, it is characterised in that the scan drive circuit includes pixel compensation circuit, and the pixel is mended Repaying circuit includes：
Driving switch, the driving switch include the first control terminal, the second control terminal, first end and second end, and the driving is opened The first control terminal closed connects a reference voltage end, for receiving the reference voltage of the reference voltage end output；
First controllable switch, first controllable switch include control terminal, first end and second end, first controllable switch Control terminal connects one first scan line, and the first end of first controllable switch connects a first voltage end, described for receiving The first voltage of first voltage end output, the second end of first controllable switch connect the first end of the driving switch；
Second controllable switch, second controllable switch include control terminal, first end and second end, second controllable switch Control terminal connects one second scan line, and the first end of second controllable switch connects the second end of the driving switch；
Organic Light Emitting Diode, the Organic Light Emitting Diode include anode and cathode, the anode of the Organic Light Emitting Diode Connect the second end of second controllable switch, the minus earth of the Organic Light Emitting Diode；
3rd controllable switch, the 3rd controllable switch include control terminal, first end and second end, the 3rd controllable switch Control terminal connects a three scan line, the first end of the 3rd controllable switch connect first controllable switch second end and The first end of the driving switch, the second end of the 3rd controllable switch connect the second control terminal of the driving switch；
Storage capacitance, the storage capacitance include first end and second end, and the first end of the storage capacitance connects the driving Second control terminal of switch and the second end of the 3rd controllable switch, the second end ground connection of the storage capacitance；And
4th controllable switch, the 4th controllable switch include control terminal, first end and second end, the 4th controllable switch Control terminal connects the three scan line, and the first end of the 4th controllable switch connects second end and the institute of the driving switch The first end of the second controllable switch is stated, the second end of the 4th controllable switch connects a data cable, for receiving the data The second voltage of line output.
8. scan drive circuit according to claim 7, it is characterised in that the driving switch is double-gate film crystal Pipe, the first control terminal, the second control terminal, first end and the second end of the driving switch correspond to the double-gate film crystalline substance respectively Bottom gate, top-gated, drain electrode and the source electrode of body pipe, first controllable switch to the 4th controllable switch are nmos type film crystalline substance Body pipe, described in control terminal, first end and the second end of first controllable switch to the 4th controllable switch correspond to respectively Grid, drain electrode and the source electrode of nmos type thin film transistor (TFT).
9. a kind of flat display apparatus, it is characterised in that the flat display apparatus includes pixel compensation circuit, and the pixel is mended Repaying circuit includes：
Driving switch, the driving switch include the first control terminal, the second control terminal, first end and second end, and the driving is opened The first control terminal closed connects a reference voltage end, for receiving the reference voltage of the reference voltage end output；
First controllable switch, first controllable switch include control terminal, first end and second end, first controllable switch Control terminal connects one first scan line, and the first end of first controllable switch connects a first voltage end, described for receiving The first voltage of first voltage end output, the second end of first controllable switch connect the first end of the driving switch；
Second controllable switch, second controllable switch include control terminal, first end and second end, second controllable switch Control terminal connects one second scan line, and the first end of second controllable switch connects the second end of the driving switch；
Organic Light Emitting Diode, the Organic Light Emitting Diode include anode and cathode, the anode of the Organic Light Emitting Diode Connect the second end of second controllable switch, the minus earth of the Organic Light Emitting Diode；
3rd controllable switch, the 3rd controllable switch include control terminal, first end and second end, the 3rd controllable switch Control terminal connects a three scan line, the first end of the 3rd controllable switch connect first controllable switch second end and The first end of the driving switch, the second end of the 3rd controllable switch connect the second control terminal of the driving switch；
Storage capacitance, the storage capacitance include first end and second end, and the first end of the storage capacitance connects the driving Second control terminal of switch and the second end of the 3rd controllable switch, the second end ground connection of the storage capacitance；And
4th controllable switch, the 4th controllable switch include control terminal, first end and second end, the 4th controllable switch Control terminal connects the three scan line, and the first end of the 4th controllable switch connects second end and the institute of the driving switch The first end of the second controllable switch is stated, the second end of the 4th controllable switch connects a data cable, for receiving the data The second voltage of line output.
10. flat display apparatus according to claim 9, it is characterised in that the driving switch is brilliant for double-gate film Body pipe, the first control terminal, the second control terminal, first end and the second end of the driving switch correspond to the double-gate film respectively Bottom gate, top-gated, drain electrode and the source electrode of transistor, first controllable switch to the 4th controllable switch is nmos type film Transistor, described in control terminal, first end and the second end of first controllable switch to the 4th controllable switch correspond to respectively Grid, drain electrode and the source electrode of nmos type thin film transistor (TFT).
CN201610066459.0A 2016-01-29 2016-01-29 Pixel compensation circuit, method, scan drive circuit and flat display apparatus Active CN105489165B (en)

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CN201610066459.0A CN105489165B (en) 2016-01-29 2016-01-29 Pixel compensation circuit, method, scan drive circuit and flat display apparatus
US15/028,920 US10115340B2 (en) 2016-01-29 2016-02-25 Pixel compensation circuit, method and flat display device
PCT/CN2016/074557 WO2017128469A1 (en) 2016-01-29 2016-02-25 Pixel compensation circuit, method, and flat panel display device

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